Using bubles per minute is completely waste of time to measure your co2.You should increase it until your pH drops to the desired level and study the pH/chart to find your co2.your bubbles per minute could be 2 or 200,it doesn't matter.It is better if you increase it a bit slowly.

This is, of course, how I came to the conclusion that my CO2 level was 43.

I'm asking about bubble rates, as I stated, out of curiosity. I'm in no way implying that you can count bubbles and come to a conclusion on the amount of CO2 you have dissolved into solution.

However, I disagree that bpm is a completely useless figure to have. If you consider plant load, light and ferts, KH, pH, etc and then observe the bpm measurement, it may give you some idea of how efficient your dispersion method is.

Here's an example: I make a DIY internal reactor, run it for a week and take measurements. Then, I make a DIY external reactor, run it for a week and take measurements. If I try to match the ph for both of these reactors, then I can observe the bpm that it takes for each of these reactors to reach my desired ph and come to a pretty good conclusion as to which reactor is more efficient, as all other factors will have been equal.

That's right you can see how efficient your dispersion is,for example if you move your reactor a couple of inches further away you might need double amount of bubbles to reach the same pH but what I mean useless is because co2 is very very cheap so you don't need to be 100% efficient.Regarding your equation I'm not sure if it's right,check the co2 chart in this site

Random- I will make you happy and let you know that I have 3 bubbles per second...YES, per second!!! On my 225-260 gallon tank. I am not sure exactly how many gallons it is b/c of its odd shape. My Ph is down from 8.0 to 7.5 and unless I mix RO (which would take a long time on my size tank) thats as low as I can get it. I can' dissolve any more bubbles.

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